Improvement in safety-wheels for watches



H. B. W-EILAND,

Safety-Wheels for Watches.

Patented Nov. 10,1874.

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UNITED STATEs PATENT OFFICE.

HARRY B. WEILAND, OF MARTINSBUBG, WVEST VIRGINIA.

IMPROVEMENT IN SAFETY-WHEELS FOR WATCHES.

Specification forming part of Letters Patent No. 156,718, dated November10, 1874; application filed October 5, 1874.

To all whom it may concern:

Be it known that I, HARRY B. WEILAND, of I\Iartinsburg, in the county ofBerkeley and State of West Virginia, have invented certain new anduset'ul Improvements in Watches;

and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it pertains to make and use it, reference being had to theaccompanying drawings, which form a part of this specificaiication.

My invention relates to reversible pinions for watches; and consists inthe peculiar arrangement and combination of parts, which will be morefully described hereafter, whereby the pinion is made to detach itselffrom the center wheel in case of breakage of the spring, so as toprevent injury to the works.

The accompanying drawing represents my invention. a represents thecenter-wheel, into the center of which is secured the collet c, whichcollet forms an extension or shoulder of any suitable form upon the topof the wheel. Through the center of this collet is formed a threadedopening, through which the arbor d passes. This arbor has a short threadformed around its surface, which engages with the thread in the colletand by which the arbor and wheel are secured together. In case eitherthe arbor or wheel should be injured, they can be readily replacedwithout having to lose both wheel and arbor, as is now the case. In thetop of the collet is formed a left-handed screw-threaded recess oropening, into which a short similarly'threadcd extension, on the underside of the pinion 0, screws. Or, should it be so preferred, theextension may be formed upon the top of the collet and project up into arecess formed in the under side of the pinion. Should the springaccidentally break, the recoil of the barrel-wheel will turn the wheeltoward the left, and as the wheel and pinion are connected by aleft-handed thread, the pinion will be instantly unscrewed from thewheel and then turn freely around without communicating its motion tothe rest of the wheels. By this arrangement of parts the sudden recoiloi the barrel-wheel, which causes always more or less damage to theworks of the watch, is completely neutralized. The barrel-wheel g hasheretofore always had its teeth placed around one of its edges, at somedistance from the center, and, as a consequence, the force of the springhas always been exerted almost entirely upon that journal of the barrelnearest to the teeth, and thus always caused an unequal strain and wear.In order to prevent this I place the teeth directly around at or nearthe center of its two edges and thereby equalize the wear and strainupon both journals and cause the spring to exert its force directly uponthe barrel-wheel and thus gain additional power.

1 am aware that it is not new to attach the pinion to the center-wheelby means of a screw-shalt or arbor, and this I disclaim.

Having thus described my invention, I claim The combination of thecenter-wheel a, collet 0, screw-arbor d, and pinion 0, the collet havingeither a threaded recess in its top or a threaded neck, whereby it isattached to the pinion independently of the shaft, substantially asshown and described.

In testimony that I claim the foregoing I have hereunto set my hand this30th day 0t September, 1874.

HARRY B. IVEILAND.

Witnesses II A. LEHMANN, FRANK GLAUDY.

